Optimization of Energy Production from Two-Stage Mesophilic–Thermophilic Anaerobic Digestion of Cheese Whey Using a Response Surface Methodology Approach

Andrey A. Kovalev (), Elza R. Mikheeva, Vladimir Panchenko, Inna V. Katraeva, Dmitriy A. Kovalev, Elena A. Zhuravleva and Yuriy V. Litti
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Andrey A. Kovalev: Federal State Autonomous Educational Institution of Higher Education, Lobachevsky State University of Nizhny Novgorod, Gagarin Ave., Nizhny Novgorod 603950, Russia
Elza R. Mikheeva: Federal State Autonomous Educational Institution of Higher Education, Lobachevsky State University of Nizhny Novgorod, Gagarin Ave., Nizhny Novgorod 603950, Russia
Vladimir Panchenko: Department of Theoretical and Applied Mechanics, Russian University of Transport, Moscow 127994, Russia
Inna V. Katraeva: Federal State Autonomous Educational Institution of Higher Education, Lobachevsky State University of Nizhny Novgorod, Gagarin Ave., Nizhny Novgorod 603950, Russia
Dmitriy A. Kovalev: Federal State Budgetary Scientific Institution “Federal Scientific Agroengineering Center VIM”, 1st Institutskiy proezd, 5, Moscow 109428, Russia
Elena A. Zhuravleva: Federal Research Center “Fundamentals of Biotechnology” of the Russian Academy of Sciences, Leninsky Prospekt, 33, 2, Moscow 119071, Russia
Yuriy V. Litti: Federal Research Center “Fundamentals of Biotechnology” of the Russian Academy of Sciences, Leninsky Prospekt, 33, 2, Moscow 119071, Russia

Energies, 2022, vol. 15, issue 23, 1-14

Abstract: Spatial separation into acidogenic and methanogenic stages is considered a viable option to ensure process stability, energy efficiency and the better control of key anaerobic digestion (AD) parameters. The elucidation of the optimal modes of two-stage AD for the maximization of the recovery of biofuels (H 2 and CH 4 ) is still an urgent task, the main optimization criteria being the highest energy yield (EY) and energy production rate (EPR). In this work, a response surface methodology was used for an optimization of energy production from the two-stage mesophilic–thermophilic AD of cheese whey (CW). Three dilution rates of CW, providing values of 10.9, 14.53 and 21.8 g for the chemical oxygen demand (COD)/L in the influent and three hydraulic retention times (HRTs) (1, 2 and 3 days) in methanogenic biofilters at a constant HRT in an acidogenic biofilter of 0.42 days, were tested to optimize the EY and EPR. The desirability approach produced combined optimum conditions as follows: the dilution rate of the CW provided 17.58 g COD/L (corresponding to OLR of 6.5 g COD/(L·day)) in the influent and a HRT in the methanogenic biofilter of 2.28 days, both of which provided a maximum EPR of 80.263 kJ/(L·day) and EY of 9.56 kJ/g COD, with an overall desirability value of 0.883.

Keywords: two-stage anaerobic digestion; biohythane; mesophilic–thermophilic mode; response surface methodology; cheese whey; optimization (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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